iio: backend: add support for data alignment

Add backend support for staring the capture synchronization.
When activated, it initates a proccess that aligns the sample's most
significant bit (MSB) based solely on the captured data, without
considering any other external signals.

Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Link: https://patch.msgid.link/20250516082630.8236-3-antoniu.miclaus@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c
index e2d46c12c15f1c1327648c65119bef79ee24d75a..1fd71b52069198d68755c7d1f8bf01e1797d9398 100644 (file)
--- a/drivers/iio/industrialio-backend.c
+++ b/drivers/iio/industrialio-backend.c
@@ -826,6 +826,29 @@ int iio_backend_filter_type_set(struct iio_backend *back,
 }
 EXPORT_SYMBOL_NS_GPL(iio_backend_filter_type_set, "IIO_BACKEND");
 
+/**
+ * iio_backend_interface_data_align - Perform the data alignment process.
+ * @back: Backend device
+ * @timeout_us: Timeout value in us.
+ *
+ * When activated, it initates a proccess that aligns the sample's most
+ * significant bit (MSB) based solely on the captured data, without
+ * considering any other external signals.
+ *
+ * The timeout_us value must be greater than 0.
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_interface_data_align(struct iio_backend *back, u32 timeout_us)
+{
+       if (!timeout_us)
+               return -EINVAL;
+
+       return iio_backend_op_call(back, interface_data_align, timeout_us);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_interface_data_align, "IIO_BACKEND");
+
 /**
  * iio_backend_ddr_enable - Enable interface DDR (Double Data Rate) mode
  * @back: Backend device

diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h
index 8a1690f21318917410dd95420a304904758b0e68..c579eb5234665cec0d3a8a0da974a15c85316f00 100644 (file)
--- a/include/linux/iio/backend.h
+++ b/include/linux/iio/backend.h
@@ -110,6 +110,7 @@ enum iio_backend_filter_type {
  * @debugfs_print_chan_status: Print channel status into a buffer.
  * @debugfs_reg_access: Read or write register value of backend.
  * @filter_type_set: Set filter type.
+ * @interface_data_align: Perform the data alignment process.
  * @ddr_enable: Enable interface DDR (Double Data Rate) mode.
  * @ddr_disable: Disable interface DDR (Double Data Rate) mode.
  * @data_stream_enable: Enable data stream.
@@ -164,6 +165,7 @@ struct iio_backend_ops {
                                  unsigned int writeval, unsigned int *readval);
        int (*filter_type_set)(struct iio_backend *back,
                               enum iio_backend_filter_type type);
+       int (*interface_data_align)(struct iio_backend *back, u32 timeout_us);
        int (*ddr_enable)(struct iio_backend *back);
        int (*ddr_disable)(struct iio_backend *back);
        int (*data_stream_enable)(struct iio_backend *back);
@@ -208,6 +210,7 @@ int devm_iio_backend_request_buffer(struct device *dev,
                                    struct iio_dev *indio_dev);
 int iio_backend_filter_type_set(struct iio_backend *back,
                                enum iio_backend_filter_type type);
+int iio_backend_interface_data_align(struct iio_backend *back, u32 timeout_us);
 int iio_backend_ddr_enable(struct iio_backend *back);
 int iio_backend_ddr_disable(struct iio_backend *back);
 int iio_backend_data_stream_enable(struct iio_backend *back);